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c in (-oo:+oo)
7/9 = c/18 // - c/18
7/9-(c/18) = 0
7/9-1/18*c = 0 // - 7/9
-1/18*c = -7/9 // : -1/18
c = -7/9/(-1/18)
c = 14
c = 14
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